My browser is as zoomed out as it can be. Could you add the option to fullscreen? That might fix it.
I fussed with fullscreen options, embed size changes, etc., and it all made it worse. I had a similar issue in my editor due to the shader, and was hoping a fixed-size embed would alleviate that. Seems I can't troubleshoot further, sorry.
It's ok. Sorry I wasn't able to play your game, it looked really interesting!
